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Subject: Sharing memory between kernel and user space
Date: Tue, 30 May 2006 15:32:59 -0700
Message-ID: <14CFC56C96D8554AA0B8969DB825FEA0012B331A@chicken.machinevisionproducts.com>
Thread-Topic: Sharing memory between kernel and user space
Thread-Index: AcaEOQFsLZeNVPl8Tw6dY4bvlkakUw==
From: "Brian D. McGrew" <brian@visionpro.com>
To: <linux-kernel@vger.kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
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I have a question about the best way to share memory between user and
kernel space.

Let's say I have a common structure;

struct counter {
	u_long interrupt_counts;
	bool saw_interupt;
}

And I need to be able to modify these elements from both the kernel and
user space.  What is the best way to allocate this???  I've tried
several methods including __get_free_pages, alloc_pages, vmalloc and so
on; and thus far, I'm just confused myself.

Can someone help me out here with a quick example of some sort???

Thanks,

:b!

Brian D. McGrew { brian@visionpro.com || brian@doubledimension.com }
--
> This is a test.  This is only a test!
  Had this been an actual emergency, you would have been
  told to cancel this test and seek professional assistance!

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